CN104335109A - Optical stack with asymmetric diffuser - Google Patents
Optical stack with asymmetric diffuser Download PDFInfo
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- CN104335109A CN104335109A CN201280057447.1A CN201280057447A CN104335109A CN 104335109 A CN104335109 A CN 104335109A CN 201280057447 A CN201280057447 A CN 201280057447A CN 104335109 A CN104335109 A CN 104335109A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133504—Diffusing, scattering, diffracting elements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
- G02F1/133536—Reflective polarizers
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
Abstract
The present disclosure describes an optical stack that includes an asymmetric diffuser. As described herein, use of an asymmetric diffuser in an optical stack reduces undesirable defects in a display while maintaining optical gain and/or contrast of the display. The asymmetric diffuser is less diffusive along a first direction that is parallel with linearly extending structures of an associated light directing film.
Description
Technical field
The disclosure relates to the optical display and other aspects that comprise asymmetric diffuser.
Background technology
Display system (such as, liquid crystal display (LCD) system) in multiple application and commercial devices, such as, graphoscope, personal digital assistant (PDA), mobile phone, Miniature musical player and thin LCD TV etc.Many LCD comprise liquid crystal panel and the extended area light source for irradiating liquid crystal panel, are commonly referred to backlight.Backlight can comprise one or more lamp and multiple light control film.
Summary of the invention
The disclosure describes the optical stack and other aspects that comprise asymmetric diffuser.
Describe optical stack in many embodiment:.Optical stack comprises the first optical stack and is arranged on the second optical stack on the first optical stack.First optical stack comprises light-guiding film, and described light-guiding film has the average effective transmissivity of at least 1.3, and has structurized first first type surface of the multiple linear structures extended along first direction.Second optical stack comprises liquid crystal panel, the reflective polarizer be arranged on liquid crystal panel, and is arranged on the asymmetric Light diffuser on reflective polarizer.Asymmetric Light diffuser is along the less diffusion of first direction, and the more diffusion of second direction that edge is orthogonal with first direction.Reflective polarizer reflects the light with the first polarization state substantially, and transmission has the light of second polarization state vertical with the first polarization state substantially.Most of physical contact with one another of every two adjacent major surface in second optical stack.
As the dull non-increasing of function at visual angle when the average effective transmissivity of optical stack is increased to about 55 degree at visual angle from about 35 degree.Optical stack and respective display as herein described can provide the one or more advantages being better than previous optical stack or display.Such as, previous display affects by less desirable defect such as ripple and other optical defects.The previous trial of hiding these undesirably defects causes the contrast of optical gain and the reduction reduced in the display.The disclosure describes and reduces the use that less desirable defect maintains the optical gain of display and/or the asymmetric diffuser of contrast simultaneously.These and other advantages of the various embodiments of optical stack as herein described and display will be apparent for the those skilled in the art reading disclosure provided in this article.
Accompanying drawing explanation
By reference to the accompanying drawings, with reference to the following detailed description to multiple embodiment of the present disclosure, can the comprehend disclosure, wherein:
Fig. 1 is the schematic side elevation of exemplary display;
Fig. 2 is the schematic side elevation of the optical system for measuring effective transmissivity;
Fig. 3 is the top view light micrograph of exemplary asymmetric diffuser; And
Fig. 4 is the chart of the display brightness (effective transmissivity) of function as vertical polar angle.
Schematic diagram provided herein may not be drawn in proportion.Like numerals will used in figure all refers to similar assembly, step etc.But, should be appreciated that and use label to be not intended to be limited in another accompanying drawing with the assembly of identical labelled notation to the assembly referred in given accompanying drawing.In addition, different labels is used to be not intended to show that the different assembly of label can not be identical or similar to refer to assembly.
Embodiment
In the following specific embodiments, with reference to the accompanying drawing forming its part, show multiple specific embodiments of device, system and method in the drawings in an exemplary manner.Should be appreciated that when do not depart from the scope of the present invention or spirit, contemplate other embodiments can modifying.Therefore, following embodiment does not have restrictive, sense.
Except as otherwise noted, otherwise all scientific and technical terminologies used herein to have in this area conventional implication.The definition provided herein is conducive to understanding frequent some term used herein, and and does not mean that restriction the scope of the present disclosure.
Unless present disclosure otherwise explicitly points out, otherwise the singulative used in this specification and the appended claims " ", " one " and " described " contain the embodiment with plural form.
Unless present disclosure otherwise explicitly points out, otherwise the term "or" used in this specification and the appended claims generally uses with the meaning comprising "and/or".
As used herein, " having ", " comprising ", " comprising " etc. use with the implication of its opening, and typically refer to " including but not limited to ".Should be appreciated that term " by ... composition " and " substantially by ... form " be included in scope that term " comprises " etc.
Any direction mentioned herein, such as " top ", " bottom ", " left side ", " right side ", " top ", " bottom ", " top ", " below " and other directions and orientation, described by having in this article with reference to accompanying drawing all for clarity, be not intended to the use limiting practical devices or system or device or system.Multiple device as herein described, goods or system can use in multiple directions and orientation.
The disclosure describes the optical stack and other aspects that comprise asymmetric diffuser.As described herein, in optical stack, use asymmetric diffuser to reduce in display undesirably defect maintain optical gain and/or the contrast of display simultaneously.Asymmetric diffuser is along the less diffusion of first direction, and what described first direction was parallel to relevant light-guiding film extends linearly structure.Although the disclosure is not limited, the example provided below through discussion, will recognize various aspects of the present disclosure.
Fig. 1 is the schematic side elevation of the exemplary display 10 for showing information to observer 1.Display 10 comprises the first optical stack 20 be optically arranged between the second optical stack 30 and backlight 40.First optical stack 20 and the second optical stack 30 form optical stack 25.
First optical stack 20 comprises light redirecting films 21.Light redirecting films 21 comprises and has structurized surperficial 22 of the multiple linear structures 24 extended along first direction or y-axis.In many embodiment:, linear structure 24 can towards the second optical stack 30.In certain embodiments, linear structure 24 can deviate from the second optical stack 30 or face backlight 40.Linear structure 24 can be spaced apart from the second optical stack 30, or air gap can being separated linear structure 24 from the second optical stack 30 at least partially.Linear structure 24 can be prism or prism structure, its have from 70 to 120 degree scope in, or from 80 to 110 degree scope in, from 85 to 95 degree scope in, from 88 to 92 degree scope in, from 89 to 90 degree scope in drift angle or angle, peak.
The asymmetric diffuser 36 that second optical stack 30 comprises liquid crystal panel 32, is arranged on the reflective polarizer 34 on liquid crystal panel 32 and is arranged on reflective polarizer 34.In certain embodiments, liquid crystal panel 32 is adhered to reflective polarizer 34 by adhesive phase 38.In many embodiment:, asymmetric diffuser 36 is towards the first optical stack 20 or structurized surperficial 22.In certain embodiments, liquid crystal panel 32 is separated from reflective polarizer 34 by air gap 38.In these embodiments, asymmetric diffuser 36 deviates from the first optical stack 20 or structurized surperficial 22, and towards liquid crystal panel 32.
Liquid crystal panel 32 can have any usable size and be used as televisor in many embodiment:.In many embodiment:, liquid crystal panel 32 has at least 50cm or at least side direction of 75cm or diagonal-size.In many embodiment:, most of physical contact with one another of every two adjacently situated surfaces in the second optical stack 30.Such as, in the second optical stack 30 every two adjacently situated surfaces at least 50%, or at least 60%, or at least 70%, or at least 80%, or at least 90% physical contact with one another.In certain embodiments, in the second optical stack 30, each layer directly in the second optical stack, adjacent layer is formed, or through adhesive attachment to adjacent layer.Therefore in these embodiments, in the second optical stack, adjacent layer is not spaced apart from each other or is separated by air gap.
Exemplary backlight 40 comprises photoconduction 42, and this photoconduction 42 receives light by its edge from the lamp be contained in side reflectors 45 or light source 44.The light be incident on rear reflector 41 reflects towards observer 1 and optical diffuser 43 by rear reflector 41, with light 46 homogenizing of the emitting surface 47 by leaving photoconduction 42.Backlight is directly luminous (not shown) in other embodiments.
Reflecting polarizer layer 34 reflects the light with the first polarization state substantially, and transmission has the light of the second polarization state substantially, and wherein two kinds of polarization states are mutually orthogonal or vertical.Such as, the average reflectance of reflective polarizer 34 to the polarization state visible ray substantially reflected by reflective polarizer is at least about 50%, or at least about 60%, or at least about 70%, or at least about 80%, or at least about 90%, or at least about 95%.And for example, reflective polarizer 34 is to being substantially at least about 50% by the average transmittance of the polarization state visible ray of reflective polarizer transmission, or at least about 60%, or at least about 70%, or at least about 80%, or at least about 90%, or at least about 95%, or at least about 97%, or at least about 98%, or at least about 99%.In some cases, reflective polarizer 34 substantially reflects the light with the first linear polarization state (such as, in the x-direction), and substantially transmission has the light (such as, in the y-direction) of the second linear polarization state.
The reflective polarizer of any suitable type can be used for reflecting polarizer layer 34, such as, such as, multilayer optical film (MOF) reflective polarizer, there is the diffuse reflective polarizing films (DRPF) of continuous phase and disperse phase, such as can purchased from Sao Paulo, Minnesota 3M company (M Company, St.Paul, Minnesota) Vikuiti
tMdiffuse reflective polarizing films (" DRPF "), is described in (such as) U.S. Patent No. 6,719, the wire grid reflective polarizers in 426, or cholesteric reflective polarizer.
Such as, in some cases, reflective polarizer 34 can be or comprises the MOF reflective polarizer formed by the different polymer material layers replaced, one group in the layer group wherein replaced is formed by birefringent material, wherein different materials refractive index with match with a kind of light of linear polarization state polarization, do not mate with the light of orthogonal linear polarization state.In such cases, the incident light of matched polarization state is transmitted through reflective polarizer 34 substantially, and the incident light of matched polarization state is not reflected by reflective polarizer 34 substantially.In some cases, MOF reflective polarizer 34 can comprise stacking of inorganic dielectric layer.
And for example, reflective polarizer 34 can be or be included in spread state the partially reflective layer with intermediate coaxial average reflectance.Such as, partially reflective layer can have the axis average reflectivity at least about 90% for the visible ray at the middle polarization of the first plane (such as xy plane), has the axis average reflectivity in about 25% to about 90% scope for the visible ray at the middle polarization of the second plane (as xz plane) perpendicular to the first plane.This type of partially reflective layer is described in (such as) U.S. Patent Publication No. 2008/064133, and the disclosure of this patent is incorporated herein by reference in full.
In some cases, reflective polarizer 34 can be or comprises circular reflective polarizer, wherein with the light of a kind of direction circular polarization, it can be clockwise or counter clockwise direction (also referred to as dextrorotation or left hand circular polarization), preferred transmission, and the light of polarization preferably reflects in the opposite direction.The circular polarisers of one type comprises cholesteryl liquid crystal polarizer.
Optical diffuser 43 has to be hidden or covers lamp or light source 44, and the major function of light 46 that homogenizing is launched at light emission surface 47 by photoconduction 42.Optical diffuser 43 has high Optical haze and/or high optics diffuse reflectance.In many embodiment:, the Optical haze of optical diffuser 43 is not less than about 40%, or is not less than about 50%, or is not less than about 60%, or is not less than about 70%, or is not less than about 80%, or is not less than about 85%, or is not less than about 90%, or is not less than about 95%.And for example, the optics diffuse reflectance of optical diffuser is not less than about 30%, or is not less than about 40%, or is not less than about 50%, or is not less than about 60%.Optical diffuser 43 can be or comprises can be needed and/or available any optical diffuser in the application.Such as, optical diffuser 43 can be or comprises surface diffuser, volume diffuser, or their combination.
Rear reflector 41 receives the light launched along negative z-direction away from observer 1 by photoconduction 42 and received light is reflexed to observer 1.The display system (such as display system 10) that wherein lamp or light source 44 are arranged along the edge of photoconduction is commonly referred to side light type or backlight display or optical system.Rear reflector 41 can be can be needed and/or the reverberator of any type of practicality in the application.Such as, rear reflector can be specular reflector, half minute surface or half diffuse reflector, or diffuse reflector.Such as, reverberator can be aluminizer or multiple layer polymer reflectance coating, enhanced specular reflector (ESR) film of such as (can purchased from Sao Paulo, Minnesota 3M company (St.Paul, MN)).
Asymmetric diffuser 36 can be volume Light diffuser or surface light diffusion body.Asymmetric diffuser 36 is along the less diffusion of first direction and along the more diffusion of second direction, wherein second direction is orthogonal to first direction.In many embodiment:, first direction is parallel to first direction or the y-axis of the linear structure 24 of light redirecting films 20, or along its alignment.In these embodiments, the linear structure 24 of light redirecting films 20 extends along y-axis l in a first direction, and asymmetric diffuser 36 is along y-axis along the less diffusion of identical first direction.Find the lightness and the contrast that by this way linear structure 24 orientation of asymmetric diffuser 36 and light redirecting films 20 are maintained display, covered simultaneously or eliminate less desirable optical defect in display.In certain embodiments, extending linearly between direction and the less diffuse direction of asymmetric diffuser 36 of prism structure 24 can be desirably in there are some non-zero angles.
In many embodiment:, asymmetric Light diffuser 36 is along having the first direction at the first visual angle and having the second direction scattered light at the second visual angle, and the ratio at this second visual angle and the first visual angle is at least 1.5, or is at least 2, or is at least 2.5, or is at least 3.
Light redirecting films 20 for liquid crystal display systems can improve or improve the lightness of display.In these cases, light redirecting films has the effective transmissivity (ET) or the relative gain that are greater than 1.As used herein, " effective transmissivity " is the brightness that there is the display system of film in place in display system and the ratio of brightness of display that wherein there is not film in place.
Fig. 2 is the schematic side elevation of the optical system 100 for measuring effective transmissivity.Optical system 100 is centered by optical axis 150 and comprise hollow lambert light box 110, linear optical absorption type polarizer 120 and photodetector 130, and described hollow lambert light box launches lambert's light 115 by launching or leaving surface 112.Light box 170 is illuminated by the stable wideband light source 160 being connected to light box inside 180 by optical fiber 170.Position 140 place between light box and absorption-type linear polarization is arranged on by the test sample of optical system measuring ET by needing.
The ET of optical stack 25 or light-guiding film 20 is by placing optical stack 25 in position 140 or light-guiding film 20 is measured, and its linear prisms 22 is towards light inspection device.By the spectral weighting axial brightness I1 (brightness along optical axis 250) of photo-detector measurement through linear absorbing polarizer.Remove optical stack 25 or light-guiding film 20, and when optical stack 25 or light-guiding film 20 are not placed on position 140 measure spectrum weighting axial brightness I2.ET is ratio I1/I2.ET0 be when linear prism 22 along be parallel to linear absorbing polarizer 120 polarization axle direction extend time effective transmissivity, and ET90 be when linear prism 22 along the polarization axle perpendicular to linear absorbing polarizer direction extension time effective transmissivity.The mean value that average effective transmissivity (ETA) is ET0 and ET90.
Effective transmittance values of measurement disclosed herein utilizes the SpectraScan for photodetector 130
tMpR-650 spectrocolorimeter (can purchased from American California look into the light research company (Photo Research, Inc, Chatsworth) of hereby Butterworth) records.Light box 110 to be total reflectivities be about 85% teflon cube.
In some cases, such as when during light redirecting films 20 is for display system 10 with increase lightness and linear prism has the refractive index being greater than about 1.6 time, the average effective transmissivity (ETA) of light redirecting films is not less than about 1.3, or be not less than about 1.4, or be not less than about 1.5, or be not less than about 1.6, or be not less than about 1.65, or be not less than about 1.7, or be not less than about 1.75, or be not less than about 1.8.
As shown in example, steadily reduce when the average effective transmissivity of optical stack 25 increases at visual angle.This optical characteristics reduces or eliminates optical defect when observer changes visual angle.In many embodiment:, about 55 degree are increased to from about 35 degree at visual angle, or increase to about 60 degree from 30 degree, or increase to about 65 degree from 25 degree, or increase to about 70 degree from 20 degree, or increase to about 75 degree from 15 degree, or increase to about 80 degree from 10 degree, or when increasing to about 85 degree from 5 degree, the average effective transmissivity dullness of optical stack 25 reduces.In certain embodiments, when increasing to about 85 degree at visual angle from about 5 degree, the average effective transmissivity dullness of optical stack 25 reduces or keeps constant.
In many embodiment:, as with there is same configuration but compared with the optical stack not comprising asymmetric Light diffuser, the average effective transmissivity of optical stack 25 is lower or lower than it by no more than about 15% unlike it.In other embodiments, as with there is same configuration but compared with the optical stack not comprising asymmetric Light diffuser, the average effective transmissivity of optical stack 25 is lower or lower than it by no more than about 10% unlike it.In other embodiments, as with there is same configuration but compared with the optical stack not comprising asymmetric Light diffuser, the average effective transmissivity of optical stack 25 is lower or lower than it by no more than about 8% unlike it.In other embodiments, as with there is same configuration but compared with the optical stack not comprising asymmetric Light diffuser, the average effective transmissivity of optical stack 25 is lower or lower than it by no more than about 5% unlike it.
example 1
Optical stack assembles as follows.LCD can obtain from Sony NSX-32GT1 televisor (can purchased from the U.S. of Sony (New York NY)).Optically clear adhesive (can trade name OCA8171 purchased from 3M company) can be used to be bonded on the downside of panel by the sheet layer of reflective polarizer (can derive from 3M company (St.Paul MN) DBEF-Q), and wherein the light transmission shaft of polarizer is along the horizontal direction orientation of LCD.What the reflective polarizer sheet material side of LCD was dorsad formed is asymmetric in greater detail diffuser below; This asymmetric diffuser has organizes parallel construction more, and each structure has the capable approximate shapes of the ellipse of elongation.Asymmetric diffuser is oriented to make transverse be parallel to the light transmission shaft of reflective polarizer; Orientation in like fashion, maximum diffuse direction is vertical, perpendicular to light transmission shaft.What be separated from it below reflective polarizer sheet material and by air gap is prismatic film (have 90 degree of drift angles and 50 micron pitch can purchased from the BEF III-10T of 3M company).Prism is roughly parallel to the long axis direction orientation of the ellipse of elongation.What be directly separated from it below prismatic film and by air gap is the micro-lens sheet (diffuser) obtained from Samsung UN32C4000 televisor (can obtain u s company of Parker Samsung (Samsung USA, Richfield Park NJ) purchased from Rui Qi Fil, New Jersey).What be just separated from it below micro-lens sheet and by air gap is the optical plate obtained from Sony's NSX-32GT1 televisor equally.The photoconduction being derived from this televisor uses 80 3mm to be multiplied by the LED of 5mm in top luminescence.
Asymmetric diffuser on the downside of reflective polarizer is prepared as follows.Such as, openly apply for No.WO00/48037 and U.S. Patent No. 7,350,442 and 7,328 at PCT, the diamond turning system with fast tool servo (FTS) described in 638 is used for creating cylindrical tools for micro replication.Cylindrical rotate along its central shaft time, diamond cutter be orthogonal to periphery move thus around cylindrical rollers cutting thread path.When cutter moves with cutting roller material along the direction being orthogonal to roller surface, to be moved into cutter by the width of the material of cutter cuts and shift out or cut and cut out and change.Operation for creating tools for micro replication openly applies for further describing in No.WO2010/041261 and the U.S. pending patent application 61/236772 at PCT.Be subsequently used in U.S. Patent No. 5,175,030 (Lu) and 5,183, the method described in 597 (Lu), the downside of reflective polarizer is replicated in the structure created in cylindrical tool.Fig. 3 is the top view light micrograph of asymmetric diffuser.
Elongated structure shown in Fig. 3 has the average length of about 160 microns and divides the mean breadth of about 10 microns in widest part.The averaged maximum height of this structure is about 2 microns.
Display brightness (effective transmissivity) as the function of vertical polar angle uses Eldim EZContrast88LW (can purchased from Market Tech company limited of Si Keci paddy city, Canadian California (Market Tech Inc., Scotts Valley CA)) to measure.The data obtained is shown in the curve map of Fig. 4.
example 2
Optical stack assembles identically with example 1, is formed, to make them approximately perpendicular to prism perpendicular to their directions in this example unlike asymmetric diffuser arrangements.In this orientation, the direction of maximum diffusion is level.
Display brightness (effective transmissivity) as the function of vertical polar angle is measured identically with described in example 1.The data obtained is shown in the curve map of Fig. 4.
example 3
Optical stack assembles identically with example 1, is substituted by the reflective polarizer (can purchased from the DBEF-Q of 3M company) without diffuser unlike the reflective polarizer films with asymmetric diffuser.
Display brightness (effective transmissivity) as the function of vertical polar angle is measured identically with described in example 1.The data obtained is shown in the curve map of Fig. 4.
example 4
Visual angle is measured for the single film be made up of the reflective polarizer of the asymmetric diffuser with example 1.Horizontal view angle (angle of its peak value half is down in lightness at it) is defined as 1.5 degree, and vertical angle of view is 17.1 degree.These are measured with collimated light sources and radiant image spheroid (can purchased from the IS-Sa scattering of Radiant ZEMAX company (Radiant ZEMAX, LLC, Redmond WA) and semblance measure system).
example 5
Visual angle is measured with the single film be made up of the reflective polarizer DBEF-D2-400 (can purchased from 3M company (3M Company)) with conventional symmetric diffuser.Visual angle is measured identically with example 4, and is defined as 11.3 degree and 12.8 degree in vertical direction in the horizontal direction.
example 6
The optical stack that PR705SpectraScan spectroradiometer (purchased from Photo Research company limited (Photo Research Inc., Chatsworth CA)) is example 1,2 and 3 is used to measure axial brightness.Find that the optical module of example 1 and 2 has 91% of the axial brightness of the optical module of example 3.
Therefore, the embodiment of the optical stack with asymmetric diffuser is disclosed.One skilled in the art will appreciate that blooming as herein described and membrane product are put into practice by the embodiment being different from those embodiments disclosed herein.The disclosed embodiments are only and illustrate and unrestricted object and providing.
Exemplary embodiment comprises as follows:
Item 1: a kind of optical stack, comprising:
First optical stack and the second optical stack be arranged on the first optical stack, described first optical stack comprises:
Light-guiding film, described light-guiding film has the average effective transmissivity of at least 1.3 and comprises structurized first first type surface, and described structurized first first type surface comprises the multiple linear structures extended along first direction,
Described second optical stack, comprising:
Liquid crystal panel;
Be arranged on the reflective polarizer on liquid crystal panel, described reflective polarizer reflects the light with the first polarization state substantially, and transmission has the light of second polarization state vertical with the first polarization state substantially; And
Asymmetric Light diffuser, described asymmetric Light diffuser is arranged on reflective polarizer, and along the less diffusion of first direction and along the second direction more diffusion orthogonal with first direction, most of physical contact with one another of every two adjacent major surface in second optical stack, as the dull non-increasing of the function at visual angle when wherein the average effective transmissivity of optical stack is increased to about 55 degree at visual angle from about 35 degree.
Item 2: the optical stack of item 1, wherein said light-guiding film has the average effective transmissivity of at least 1.4.
Item 3: the optical stack of item 1, wherein said light-guiding film has the average effective transmissivity of at least 1.5.
Item 4: the optical stack of item 1, wherein said light-guiding film has the average effective transmissivity of at least 1.6
Item 5: the optical stack of item 1, in the first first type surface of wherein said light-guiding film, multiple linear structure comprises the multiple linear prismatic structures extended along first direction.
Item 6: the optical stack of item 5, wherein each linear prismatic structures has peak value and peak value angle, and described peak value angle is in the scope from 70 to 120 degree.
Item 7: the optical stack of item 5, wherein each linear prismatic structures has peak value and peak value angle, and described peak value angle is in the scope from 80 to 110 degree.
Item 8: the optical stack of item 5, wherein each linear prismatic structures has peak value and peak value angle, and described peak value angle is in the scope from 85 to 95 degree.
Item 9: the optical stack of item 5, wherein each linear prismatic structures has peak value and peak value angle, and described peak value angle is in the scope from 88 to 92 degree.
Item 10: the optical stack of item 1, structurized first first type surface of wherein said light-guiding film is towards the second optical stack.
Item 11: the optical stack of item 1, structurized first first type surface second optical stack dorsad of wherein said light-guiding film.
12: the optical stack of item 1, wherein said light-guiding film comprise with structurized first first type surface back to the second first type surface, described second first type surface is structured.
13: the optical stack of item 1, wherein said light-guiding film comprise with structurized first first type surface back to the second first type surface, described second first type surface is not structured.
Item 14: the optical stack of item 1, the first type surface of wherein said liquid crystal panel has the diagonal line of at least 50cm.
Item 15: the optical stack of item 1, the first type surface of wherein said liquid crystal panel has the diagonal line of at least 75cm.
Item 16: the optical stack of item 1, wherein said reflective polarizer reflection has at least 60% of the light of the first polarization state, and transmission has at least 60% of the light of the second polarization state.
Item 17: the optical stack of item 1, wherein said reflective polarizer reflection has at least 70% of the light of the first polarization state, and transmission has at least 70% of the light of the second polarization state.
Item 18: the optical stack of item 1, wherein said reflective polarizer reflection has at least 80% of the light of the first polarization state, and transmission has at least 80% of the light of the second polarization state.
Item 19: the optical stack of item 1, wherein said reflective polarizer reflection has at least 90% of the light of the first polarization state, and transmission has at least 90% of the light of the second polarization state.
Item 20: the optical stack of item 1, wherein said asymmetric Light diffuser comprises volume Light diffuser.
Item 21: the optical stack of item 1, wherein said asymmetric Light diffuser comprises surface light diffusion body.
Item 22: the optical stack of item 1, wherein said asymmetric Light diffuser makes light along the first direction with the first visual angle and along the second direction scattering with the second visual angle, the ratio at described second visual angle and described first visual angle is at least 1.5.
Item 23: the optical stack of item 1, wherein said asymmetric Light diffuser makes light along the first direction with the first visual angle and along the second direction scattering with the second visual angle, the ratio at described second visual angle and described first visual angle is at least 2.
Item 24: the optical stack of item 1, wherein said asymmetric Light diffuser makes light along the first direction with the first visual angle and along the second direction scattering with the second visual angle, the ratio at described second visual angle and described first visual angle is at least 2.5.
Item 25: the optical stack of item 1, wherein said asymmetric Light diffuser makes light along the first direction with the first visual angle and along the second direction scattering with the second visual angle, the ratio at described second visual angle and described first visual angle is at least 3.
Item 26: the optical stack of item 1, at least 50% physical contact with one another of every two adjacent major surface in wherein said second optical stack.
Item 27: the optical stack of item 1, at least 60% physical contact with one another of every two adjacent major surface in wherein said second optical stack.
Item 28: the optical stack of item 1, at least 70% physical contact with one another of every two adjacent major surface in wherein said second optical stack.
Item 29: the optical stack of item 1, at least 80% physical contact with one another of every two adjacent major surface in wherein said second optical stack.
Item 30: the optical stack of item 1, at least 90% physical contact with one another of every two adjacent major surface in wherein said second optical stack.
Item 31: the optical stack of item 1, in wherein said second optical stack, the adjacent layer of each layer directly in the second optical stack is formed, or through adhesive attachment to adjacent layer.
Item 32: the optical stack of item 1, when wherein increasing to about 60 degree at visual angle from about 30 degree, the average effective transmissivity dullness of described optical stack reduces.
Item 33: the optical stack of item 1, when wherein increasing to about 65 degree at visual angle from about 25 degree, the average effective transmissivity dullness of described optical stack reduces.
Item 34: the optical stack of item 1, when wherein increasing to about 70 degree at visual angle from about 20 degree, the average effective transmissivity dullness of described optical stack reduces.
Item 35: the optical stack of item 1, when wherein increasing to about 75 degree at visual angle from about 15 degree, the average effective transmissivity dullness of described optical stack reduces.
Item 36: the optical stack of item 1, when wherein increasing to about 80 degree at visual angle from about 10 degree, the average effective transmissivity dullness of described optical stack reduces.
Item 37: the optical stack of item 1, when wherein increasing to about 85 degree at visual angle from about 5 degree, the average effective transmissivity dullness of described optical stack reduces.
Item 38: the optical stack of item 37, wherein when visual angle increases in a part for the angular field of view from 5 to 85 degree, the average effective transmissivity of described optical stack keeps constant.
Item 39: the optical stack of item 1, is included in the air gap between described first optical stack and described second optical stack.
40: the optical stack of item 1, wherein with there is same configuration but the optical stack not comprising described asymmetric Light diffuser compares, the average effective transmissivity of described optical stack is lower or lower than it by no more than about 15% unlike it.
41: the optical stack of item 1, wherein with there is same configuration but the optical stack not comprising described asymmetric Light diffuser compares, the average effective transmissivity of described optical stack is lower or lower than it by no more than about 10% unlike it.
42: the optical stack of item 1, wherein with there is same configuration but the optical stack not comprising described asymmetric Light diffuser compares, the average effective transmissivity of described optical stack is lower or lower than it by no more than about 8% unlike it.
43: the optical stack of item 1, wherein with there is same configuration but the optical stack not comprising described asymmetric Light diffuser compares, the average effective transmissivity of described optical stack is lower or lower than it by no more than about 5% unlike it.
Item 44: the optical stack of item 1, wherein said asymmetric Light diffuser is towards structurized first first type surface of light-guiding film.
Item 45: the optical stack of item 1, structurized first first type surface of wherein said asymmetric Light diffuser away from light guide film.
Item 46: the optical stack of item 1, wherein said reflecting polarizer layer comprises alternating layer, and at least one of described alternating layer comprises birefringent material.
Item 47: the optical stack of item 1, wherein said reflecting polarizer layer comprises wire grid reflective polarizers.
Item 48: the optical stack of item 1, wherein said reflecting polarizer layer comprises cholesteric reflective polarizer.
Item 49: the optical stack of item 1, wherein said reflecting polarizer layer comprises many substantially parallel fibers, and described fiber comprises birefringent material.
Item 50: the optical stack of item 1, wherein said reflecting polarizer layer comprises diffuse reflective polarizing films (DRPF).
Claims (10)
1. an optical stack, comprising:
First optical stack and the second optical stack be arranged on described first optical stack, described first optical stack comprises:
Light-guiding film, described light-guiding film has the average effective transmissivity of at least 1.3 and comprises structurized first first type surface, and described structurized first first type surface comprises the multiple linear structures extended along first direction,
Described second optical stack comprises:
Liquid crystal panel;
Be arranged on the reflective polarizer on described liquid crystal panel, described reflective polarizer reflects the light with the first polarization state substantially, and transmission has the light of second polarization state vertical with described first polarization state substantially; And
Asymmetric Light diffuser, described asymmetric Light diffuser is arranged on described reflective polarizer, and along the less diffusion of described first direction and along the second direction more diffusion orthogonal with described first direction, most of physical contact with one another of every two adjacent major surface in described second optical stack, as the dull non-increasing of function at described visual angle when the average effective transmissivity of wherein said optical stack is increased to about 55 degree at visual angle from about 35 degree.
2. optical stack according to claim 1, wherein said light-guiding film has the average effective transmissivity of at least 1.4.
3. optical stack according to claim 1, wherein said light-guiding film comprise with described structurized first first type surface back to the second first type surface, described second first type surface is structured.
4. optical stack according to claim 1, wherein said light-guiding film comprise with described structurized first first type surface back to the second first type surface, described second first type surface is not structured.
5. optical stack according to claim 1, the first type surface of wherein said liquid crystal panel has the diagonal line of at least 50cm.
6. optical stack according to claim 1, wherein said asymmetric Light diffuser makes light along the described first direction with the first visual angle and along the described second direction scattering with the second visual angle, the ratio at described second visual angle and described first visual angle is at least 1.5.
7. optical stack according to claim 1, at least 50% physical contact with one another of every two adjacent major surface in wherein said second optical stack.
8. optical stack according to claim 1, when wherein increasing to about 60 degree at visual angle from about 30 degree, the average effective transmissivity dullness of described optical stack reduces.
9. optical stack according to claim 1, is included in the air gap between described first optical stack and described second optical stack.
10. optical stack according to claim 1, wherein with there is same configuration but the optical stack not comprising described asymmetric Light diffuser compares, the average effective transmissivity of described optical stack is lower or lower than it by no more than about 15% unlike it.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201161563145P | 2011-11-23 | 2011-11-23 | |
| US61/563,145 | 2011-11-23 | ||
| PCT/US2012/066213 WO2013078278A1 (en) | 2011-11-23 | 2012-11-21 | Optical stack with asymmetric diffuser |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104335109A true CN104335109A (en) | 2015-02-04 |
| CN104335109B CN104335109B (en) | 2018-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201280057447.1A Active CN104335109B (en) | 2011-11-23 | 2012-11-21 | optical stack with asymmetric diffuser |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US9618791B2 (en) |
| JP (1) | JP6243344B2 (en) |
| KR (1) | KR101989207B1 (en) |
| CN (1) | CN104335109B (en) |
| TW (1) | TWI606271B (en) |
| WO (1) | WO2013078278A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106461819A (en) * | 2014-05-30 | 2017-02-22 | 3M创新有限公司 | Optical systems having variable viewing angles |
| CN107750343A (en) * | 2015-06-15 | 2018-03-02 | 3M创新有限公司 | Include the optical stack of reflection-absorption type polarizer |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9070312B2 (en) * | 2013-11-05 | 2015-06-30 | 3M Innovative Properties Company | Hybrid self illuminated and actively back lit signage for printed graphics |
| CN106414057A (en) * | 2014-01-22 | 2017-02-15 | 3M创新有限公司 | Microoptics for glazing |
| CN107075898B (en) | 2014-10-20 | 2020-02-18 | 3M创新有限公司 | Insulating glazing unit and microoptical layer including microstructured diffuser and method |
| CN108288260A (en) * | 2018-01-30 | 2018-07-17 | 苏州亚相素自动化科技有限公司 | The image pre-processing method of real-time deep or light correction |
| CN113196115A (en) | 2018-12-14 | 2021-07-30 | 3M创新有限公司 | Liquid crystal display with front side light control film |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6364497B1 (en) * | 1999-03-24 | 2002-04-02 | L G Chemical Ltd. | Backlight system |
| WO2006026743A1 (en) * | 2004-08-31 | 2006-03-09 | Fusion Optix, Inc. | Enhanced light diffusing sheet |
| US20060056166A1 (en) * | 2004-09-09 | 2006-03-16 | Yeo Terence E | Enhanced LCD backlight |
| CN1831569A (en) * | 2005-03-10 | 2006-09-13 | 大赛璐化学工业株式会社 | Anisotropic scattering sheet |
| CN1888959A (en) * | 2005-06-29 | 2007-01-03 | Lg.菲利浦Lcd株式会社 | Prism sheet and liquid crystal display device having the back light unit |
| US20090079909A1 (en) * | 1993-12-21 | 2009-03-26 | 3M Innovative Properties Company | Display incorporating reflective polarizer |
| CN101535880A (en) * | 2006-11-15 | 2009-09-16 | 3M创新有限公司 | Back-lit displays with high illumination uniformity |
| TW201106012A (en) * | 2009-06-02 | 2011-02-16 | 3M Innovative Properties Co | Light redirecting film and display system incorporating same |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5175030A (en) | 1989-02-10 | 1992-12-29 | Minnesota Mining And Manufacturing Company | Microstructure-bearing composite plastic articles and method of making |
| US5183597A (en) | 1989-02-10 | 1993-02-02 | Minnesota Mining And Manufacturing Company | Method of molding microstructure bearing composite plastic articles |
| US6322236B1 (en) | 1999-02-09 | 2001-11-27 | 3M Innovative Properties Company | Optical film with defect-reducing surface and method for making same |
| US6719426B2 (en) | 2002-02-28 | 2004-04-13 | 3M Innovative Properties Company | Compound polarization beam splitters |
| KR100576870B1 (en) | 2004-08-11 | 2006-05-10 | 삼성전기주식회사 | Nitride semiconductor light emitting diode and method of producing the same |
| US7446827B2 (en) * | 2004-10-15 | 2008-11-04 | 3M Innovative Properties Company | Direct-lit liquid crystal displays with laminated diffuser plates |
| US7350442B2 (en) | 2005-11-15 | 2008-04-01 | 3M Innovative Properties Company | Cutting tool having variable movement in a z-direction laterally along a work piece for making microstructures |
| US7328638B2 (en) | 2005-12-27 | 2008-02-12 | 3M Innovative Properties Company | Cutting tool using interrupted cut fast tool servo |
| US20090040772A1 (en) * | 2007-08-08 | 2009-02-12 | Rohm And Haas Denmark Finance A/S | Optical element comprising restrained asymmetrical diffuser |
| US8632497B2 (en) | 2008-10-09 | 2014-01-21 | Roche Diagnostics Operations Inc. | Skin securable drug delivery device with a shock absorbing protective shield |
| WO2011005897A2 (en) | 2009-07-09 | 2011-01-13 | Silhouette Medical Inc. | Apparatus for treating medical conditions of hollow anatomical structures |
| US8888333B2 (en) | 2009-08-25 | 2014-11-18 | 3M Innovative Properties Company | Light redirecting film and display system incorporating same |
-
2012
- 2012-11-21 KR KR1020147016759A patent/KR101989207B1/en active IP Right Grant
- 2012-11-21 JP JP2014543552A patent/JP6243344B2/en active Active
- 2012-11-21 WO PCT/US2012/066213 patent/WO2013078278A1/en active Application Filing
- 2012-11-21 US US14/360,105 patent/US9618791B2/en active Active
- 2012-11-21 CN CN201280057447.1A patent/CN104335109B/en active Active
- 2012-11-22 TW TW101143792A patent/TWI606271B/en not_active IP Right Cessation
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090079909A1 (en) * | 1993-12-21 | 2009-03-26 | 3M Innovative Properties Company | Display incorporating reflective polarizer |
| US6364497B1 (en) * | 1999-03-24 | 2002-04-02 | L G Chemical Ltd. | Backlight system |
| WO2006026743A1 (en) * | 2004-08-31 | 2006-03-09 | Fusion Optix, Inc. | Enhanced light diffusing sheet |
| US20060056166A1 (en) * | 2004-09-09 | 2006-03-16 | Yeo Terence E | Enhanced LCD backlight |
| CN1831569A (en) * | 2005-03-10 | 2006-09-13 | 大赛璐化学工业株式会社 | Anisotropic scattering sheet |
| CN1888959A (en) * | 2005-06-29 | 2007-01-03 | Lg.菲利浦Lcd株式会社 | Prism sheet and liquid crystal display device having the back light unit |
| CN101535880A (en) * | 2006-11-15 | 2009-09-16 | 3M创新有限公司 | Back-lit displays with high illumination uniformity |
| TW201106012A (en) * | 2009-06-02 | 2011-02-16 | 3M Innovative Properties Co | Light redirecting film and display system incorporating same |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106461819A (en) * | 2014-05-30 | 2017-02-22 | 3M创新有限公司 | Optical systems having variable viewing angles |
| CN106461819B (en) * | 2014-05-30 | 2019-09-06 | 3M创新有限公司 | Optical system with variable visual angle |
| CN107750343A (en) * | 2015-06-15 | 2018-03-02 | 3M创新有限公司 | Include the optical stack of reflection-absorption type polarizer |
| CN107750343B (en) * | 2015-06-15 | 2021-03-05 | 3M创新有限公司 | Optical stack including reflective-absorptive polarizer |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6243344B2 (en) | 2017-12-06 |
| US9618791B2 (en) | 2017-04-11 |
| JP2015504536A (en) | 2015-02-12 |
| CN104335109B (en) | 2018-01-12 |
| KR20140097407A (en) | 2014-08-06 |
| TWI606271B (en) | 2017-11-21 |
| TW201329528A (en) | 2013-07-16 |
| KR101989207B1 (en) | 2019-06-13 |
| WO2013078278A1 (en) | 2013-05-30 |
| US20140285749A1 (en) | 2014-09-25 |
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